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Wed, 01 Oct 2025 23:09:22 -0700 (PDT) From: Anup Patel To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Paul Walmsley , Palmer Dabbelt , Greg KH , Alexander Shishkin , Ian Rogers Cc: Alexandre Ghiti , Peter Zijlstra , Ingo Molnar , Namhyung Kim , Mark Rutland , Jiri Olsa , Adrian Hunter , Liang Kan , Mayuresh Chitale , Anup Patel , Atish Patra , Andrew Jones , Sunil V L , linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Mayuresh Chitale , Anup Patel Subject: [PATCH 09/11] perf tools: Add RISC-V trace PMU record capabilities Date: Thu, 2 Oct 2025 11:37:30 +0530 Message-ID: <20251002060732.100213-10-apatel@ventanamicro.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251002060732.100213-1-apatel@ventanamicro.com> References: <20251002060732.100213-1-apatel@ventanamicro.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Mayuresh Chitale Introduce the required auxiliary API functions allowing the perf core to interact with RISC-V trace perf driver. Co-developed-by: Anup Patel Signed-off-by: Anup Patel Signed-off-by: Mayuresh Chitale --- tools/perf/arch/riscv/util/Build | 1 + tools/perf/arch/riscv/util/auxtrace.c | 218 ++++++++++++++++++++++++++ tools/perf/util/auxtrace.c | 1 + tools/perf/util/auxtrace.h | 1 + tools/perf/util/rvtrace.h | 18 +++ 5 files changed, 239 insertions(+) create mode 100644 tools/perf/arch/riscv/util/auxtrace.c create mode 100644 tools/perf/util/rvtrace.h diff --git a/tools/perf/arch/riscv/util/Build b/tools/perf/arch/riscv/util/Build index 58a672246024..2ba1fb98a0ad 100644 --- a/tools/perf/arch/riscv/util/Build +++ b/tools/perf/arch/riscv/util/Build @@ -3,3 +3,4 @@ perf-util-y += header.o perf-util-$(CONFIG_LIBTRACEEVENT) += kvm-stat.o perf-util-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o +perf-util-$(CONFIG_AUXTRACE) += auxtrace.o diff --git a/tools/perf/arch/riscv/util/auxtrace.c b/tools/perf/arch/riscv/util/auxtrace.c new file mode 100644 index 000000000000..adc86bd38998 --- /dev/null +++ b/tools/perf/arch/riscv/util/auxtrace.c @@ -0,0 +1,218 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Risc-V E-Trace support + */ + +#include +#include +#include +#include +#include +#include + +#include // page_size +#include "../../../util/auxtrace.h" +#include "../../../util/cpumap.h" +#include "../../../util/debug.h" +#include "../../../util/event.h" +#include "../../../util/evlist.h" +#include "../../../util/evsel.h" +#include "../../../util/rvtrace.h" +#include "../../../util/pmu.h" +#include "../../../util/record.h" +#include "../../../util/session.h" +#include "../../../util/tsc.h" + +#define RVTRACE_PMU_NAME "rvtrace" +#define KiB(x) ((x) * 1024) +#define MiB(x) ((x) * 1024 * 1024) + +struct rvtrace_recording { + struct auxtrace_record itr; + struct perf_pmu *rvtrace_pmu; + struct evlist *evlist; +}; + +static size_t rvtrace_info_priv_size(struct auxtrace_record *itr __maybe_unused, + struct evlist *evlist __maybe_unused) +{ + return RVTRACE_AUXTRACE_PRIV_SIZE; +} + +static int rvtrace_info_fill(struct auxtrace_record *itr, struct perf_session *session, + struct perf_record_auxtrace_info *auxtrace_info, size_t priv_size) +{ + struct rvtrace_recording *ptr = container_of(itr, struct rvtrace_recording, itr); + struct perf_pmu *rvtrace_pmu = ptr->rvtrace_pmu; + + if (priv_size != RVTRACE_AUXTRACE_PRIV_SIZE) + return -EINVAL; + + if (!session->evlist->core.nr_mmaps) + return -EINVAL; + + auxtrace_info->type = PERF_AUXTRACE_RISCV_TRACE; + auxtrace_info->priv[0] = rvtrace_pmu->type; + + return 0; +} + +static int rvtrace_set_auxtrace_mmap_page(struct record_opts *opts) +{ + bool privileged = perf_event_paranoid_check(-1); + + if (!opts->full_auxtrace) + return 0; + + if (opts->full_auxtrace && !opts->auxtrace_mmap_pages) { + if (privileged) { + opts->auxtrace_mmap_pages = MiB(16) / page_size; + } else { + opts->auxtrace_mmap_pages = KiB(128) / page_size; + if (opts->mmap_pages == UINT_MAX) + opts->mmap_pages = KiB(256) / page_size; + } + } + + /* Validate auxtrace_mmap_pages */ + if (opts->auxtrace_mmap_pages) { + size_t sz = opts->auxtrace_mmap_pages * (size_t)page_size; + size_t min_sz = KiB(8); + + if (sz < min_sz || !is_power_of_2(sz)) { + pr_err("Invalid mmap size : must be at least %zuKiB and a power of 2\n", + min_sz / 1024); + return -EINVAL; + } + } + + return 0; +} + +static int rvtrace_recording_options(struct auxtrace_record *itr, struct evlist *evlist, + struct record_opts *opts) +{ + struct rvtrace_recording *ptr = container_of(itr, struct rvtrace_recording, itr); + struct perf_pmu *rvtrace_pmu = ptr->rvtrace_pmu; + struct evsel *evsel, *rvtrace_evsel = NULL; + struct evsel *tracking_evsel; + int err; + + ptr->evlist = evlist; + evlist__for_each_entry(evlist, evsel) { + if (evsel->core.attr.type == rvtrace_pmu->type) { + if (rvtrace_evsel) { + pr_err("There may be only one " RVTRACE_PMU_NAME "x event\n"); + return -EINVAL; + } + evsel->core.attr.freq = 0; + evsel->core.attr.sample_period = 1; + evsel->needs_auxtrace_mmap = true; + rvtrace_evsel = evsel; + opts->full_auxtrace = true; + } + } + + err = rvtrace_set_auxtrace_mmap_page(opts); + if (err) + return err; + /* + * To obtain the auxtrace buffer file descriptor, the auxtrace event + * must come first. + */ + evlist__to_front(evlist, rvtrace_evsel); + evsel__set_sample_bit(rvtrace_evsel, TIME); + + /* Add dummy event to keep tracking */ + err = parse_event(evlist, "dummy:u"); + if (err) + return err; + + tracking_evsel = evlist__last(evlist); + evlist__set_tracking_event(evlist, tracking_evsel); + + tracking_evsel->core.attr.freq = 0; + tracking_evsel->core.attr.sample_period = 1; + evsel__set_sample_bit(tracking_evsel, TIME); + + return 0; +} + +static u64 rvtrace_reference(struct auxtrace_record *itr __maybe_unused) +{ + return rdtsc(); +} + +static void rvtrace_recording_free(struct auxtrace_record *itr) +{ + struct rvtrace_recording *ptr = + container_of(itr, struct rvtrace_recording, itr); + + free(ptr); +} + +static struct auxtrace_record *rvtrace_recording_init(int *err, struct perf_pmu *rvtrace_pmu) +{ + struct rvtrace_recording *ptr; + + if (!rvtrace_pmu) { + *err = -ENODEV; + return NULL; + } + + ptr = zalloc(sizeof(*ptr)); + if (!ptr) { + *err = -ENOMEM; + return NULL; + } + + ptr->rvtrace_pmu = rvtrace_pmu; + ptr->itr.recording_options = rvtrace_recording_options; + ptr->itr.info_priv_size = rvtrace_info_priv_size; + ptr->itr.info_fill = rvtrace_info_fill; + ptr->itr.free = rvtrace_recording_free; + ptr->itr.reference = rvtrace_reference; + ptr->itr.read_finish = auxtrace_record__read_finish; + ptr->itr.alignment = 0; + + *err = 0; + return &ptr->itr; +} + +static struct perf_pmu *find_pmu_for_event(struct perf_pmu **pmus, + int pmu_nr, struct evsel *evsel) +{ + int i; + + if (!pmus) + return NULL; + + for (i = 0; i < pmu_nr; i++) { + if (evsel->core.attr.type == pmus[i]->type) + return pmus[i]; + } + + return NULL; +} + +struct auxtrace_record *auxtrace_record__init(struct evlist *evlist, int *err) +{ + struct perf_pmu *rvtrace_pmu = NULL; + struct perf_pmu *found_etm = NULL; + struct evsel *evsel; + + if (!evlist) + return NULL; + + rvtrace_pmu = perf_pmus__find(RVTRACE_PMU_NAME); + evlist__for_each_entry(evlist, evsel) { + if (rvtrace_pmu && !found_etm) + found_etm = find_pmu_for_event(&rvtrace_pmu, 1, evsel); + } + + if (found_etm) + return rvtrace_recording_init(err, rvtrace_pmu); + + *err = 0; + return NULL; +} diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c index ebd32f1b8f12..735f6c360064 100644 --- a/tools/perf/util/auxtrace.c +++ b/tools/perf/util/auxtrace.c @@ -1393,6 +1393,7 @@ int perf_event__process_auxtrace_info(struct perf_session *session, case PERF_AUXTRACE_HISI_PTT: err = hisi_ptt_process_auxtrace_info(event, session); break; + case PERF_AUXTRACE_RISCV_TRACE: case PERF_AUXTRACE_UNKNOWN: default: return -EINVAL; diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h index f001cbb68f8e..5b7ce4a99709 100644 --- a/tools/perf/util/auxtrace.h +++ b/tools/perf/util/auxtrace.h @@ -50,6 +50,7 @@ enum auxtrace_type { PERF_AUXTRACE_ARM_SPE, PERF_AUXTRACE_S390_CPUMSF, PERF_AUXTRACE_HISI_PTT, + PERF_AUXTRACE_RISCV_TRACE, }; enum itrace_period_type { diff --git a/tools/perf/util/rvtrace.h b/tools/perf/util/rvtrace.h new file mode 100644 index 000000000000..93c041db8660 --- /dev/null +++ b/tools/perf/util/rvtrace.h @@ -0,0 +1,18 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright(C) 2015 Linaro Limited. All rights reserved. + * Author: Mathieu Poirier + */ + +#ifndef INCLUDE__UTIL_PERF_RVTRACE_H__ +#define INCLUDE__UTIL_PERF_RVTRACE_H__ + +#include "debug.h" +#include "auxtrace.h" +#include "util/event.h" +#include "util/session.h" +#include + +#define RVTRACE_AUXTRACE_PRIV_SIZE sizeof(u64) + +#endif -- 2.43.0